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Share-Based Compensation - Share-Based Compensation, Cash-Based Awards and Related Tax Benefit Recognized in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | $ 17.9 | $ 15.8 | $ 44.2 | $ 48.7
Income tax expense/(benefit) on share-based compensation | (1.8) | (1.8) | (4.5) | (4.2)
Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 4.1 |  | 7.1 |
Cost of Revenue [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 0.8 | 0.7 | 2.1 | 2.4
Cost of Revenue [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 0.1 |  | 0.2 |
Research and Development [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 9.0 | 8.6 | 24.6 | 25.4
Research and Development [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 3.3 |  | 5.8 |
Selling, General, and Administrative [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 8.1 | $ 6.5 | 17.5 | $ 20.9
Selling, General, and Administrative [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | $ 0.7 |  | $ 1.1 |

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